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GRP Pipe

GRP Pipes and Fittings manufactured by Watani are corrosion-resistant, flexible, composite underground systems constructed of Thermosetting Polyester Resin, Fiberglass Reinforcements, and Silica Sand. Pipes are available in stiffness Classes of 1250, 2500, 5000, and 1000 Pa. In nominal pressure classes, it is available in PN3, PN6, PN10, PN16, and PN20. These pipes are designed to withstand aggressive environments both for pressure and gravity applications and are available in Nominal Diameters (DN) from 300 mm to 2600 mm, AWWA C950, O.D. series.

Uses

Watani pipes can be used for gravity and pressure applications and are suitable for corrosive environments including aggressive sanitary sewage, raw water, potable water, sea water, fire fighting lines, and many industrial effluents with a temperature range of 40 C to 65 C. Watani pipes to be used for handling industrial effluents must be discussed with us at the design stage. 

Special pipes can be manufactured to be used for above ground or higher temperatures.
Standards
bulletANSI / AWWA                      C950
bulletASTM                                     D-3517
bulletASTM                                     D-3262
bulletASTM                                     D-3754
bulletASTM                                     D-4161
Nominal Diameter (mm) Minimum Spigot Outside Diameter (mm) Minimum Maximum Spigot Outside Diameter (mm) Maximum
300 310 311
350 378 379
400 412 413
450 463 464
500 514 515
600 616 617
700 718 719
800 820 821
900 922 923
1000 1024 1025
1100 1126 1127
1200 1228 1229
1300 1330 1331
1400 1432 1433
1500 1534 1535
1600 1636 1637
1700 1738 1739
1800 1840 1841
1900 1942 1943
2000 2044 2045
2100 2146 2147
2200 2248 2249
2300 2350 2351
2400 2452 2453
2500 2554 2555
2600 2656 2657

GRP Continuous Pipe Manufacturing Machine

Pressure and Loading Limitations
Pipes manufactured in accordance with this specification will have the following pressure capabilities, regardless of pipe stiffness.
Pressure Class PN3 PN6 PN10 PN16 PN20
Max. Continuous Operating Pressure 44 87 145 232 290
Max. Surge Pressure 17 35 58 93 116
Max. Installed (field) Test Pressure 65 130 217 348 435
Maximum Factory Test Pressure 87 174 290 464 580

Watani's design philosophy is to provide products with suitable properties and the required margin of safety that will enable the pipe to perform satisfactorily after an extended period of operation (++50 years) under typical service conditions. After over 20 years in the GRP industry, Watani is looking forward to providing GRP Piping solutions in the various areas:

bulletWater distribution both civil and industrial
bulletSewer Systems: urban and industrial
bulletWater intakes for cooling water systems
bulletIrrigation networks
bulletWaste water outflows to the river/ocean
bulletSea lines and river crossings
bulletProcess lines for industrial plants
bulletFire fighting networks
bulletCorrosive fluids and vent gas stacks
bulletWell casings and well pump risers
bulletPen Stocks
bulletGasoline handling and distribution networks
bulletFlue gas stock

Advantages - Light Weight
bulletTheir lightweight, high strength ratios require lighter support structures than the heavy metallic systems which provides additional cost savings.
bulletNo need for expensive heavy duty machinery during installation.
Corrosion Resistant
bulletNo need for linings or catholic protection.

ASTM D-3571 Hydrostatic Pressure Test

Type of Test Testing Frequency Standard Reference
Wall Thickness Each Pipe ASTM D 3517
Visual Inspection Each Pipe ASTM D 3517
Outside Diameter, Spigot End Each Pipe ASTM D 3517
Hydrostatic Pressure Each Pipe ASTM D 3571
Length Each Pipe ASTM D 3571
Barcol Hardness Each Pipe ASTM D 2583
Stiffness Once Per Day ASTM D 2412
Constituents by Wt% Once Per Day ASTM D 2584
Axial Tensile Strength Once Per Day ASTM D 0638
Circumferential Tensile Strength Once Per Day ASTM D 2290
Deflection to Crack / Damage Once Per Day ASTM D 3517
Joints - GRP Double Bell Couplings

The standard field joint shall be a Double Bell GRP Coupling. It incorporates elastomeric rubber rings which compress to form a water tight seal when the joint is assembled. The maximum angular change of direction between pipe axes must not exceed the values given in the table below.

Nominal Pipe Diameter (mm) Nominal Angular Change of Direction (Degree)
300 to 600 3.00
700 to 800 2.50
900 to 1000 2.00
1100 to 1300 1.50
1400 to 1600 1.25
1700 to 2600 1.00